Cylinder-boring machine.



H. A. PEDRIGK CYLINDER BORING MACHINE.

APPLICATION F ILED APR.16 1909.

Patented June 4, 1912.

2 BHBETS-BHEET 1.

H. PEDRIGK. CYLINDER BORING MACHINE.

APPLICATION FILED APB..16, 1909.

Patented June 4, 1912.

5 s 5*; 2 SHEETS-SHEET 2. I? l/ 1 T m I T'T )JL/ f I v i an ordlnaryUNITED STATES PATENT OFFICE.

HOWARD A. PEDRICK, or rmtAnnnHrm}, Pi:imsYLvAmA, .ASSIGNOR TO K. B.unnnawoon & oomranr or PHILAIH'IEZPHIA, PENNSYLVANIA, A FIRM.

.oYLmnnn-BonmG MACHINE.

0 all whom it may concern:

Be it known that I, HOWARD A. Penman, a .citizen of theUnitedStates,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Cylinder-Boring Machines, of which the following is aspecification.

The object of my invention is to provide a machine for the quick,accurate and con venient boring or reboring of the cylinders of gasengines or other structures in which the cylinders are closed at one endand consequently will not permit of the use of boring bar, the inventionbeing especially applicable to the boring or reboring of the cylindersof thattype of engine having a plurality of cylinde'rs formed in asingle casting, the rotation of which during the boring o eration isinconvenient if not impract-icab e.

In the' accompanying drawings'-Figu're l is a perspective view of acylinder boring machineoonstructed in' accordance with my invention;Fig. 2 is a plan or top view of a portion'of the same, Fig. 3 is a view.partly in elevation and partly in vertical section, and on a largerscale than Figs. 1 and 2, and Fig. 4 is a horizontal section on the linea-a, Fig. 3.

In the drawing, 1 represents a threearmed frame or spider mounted uponsuitable legs 2 and having a depending twopart housing 3 which providesa bearing for the hub of a worm wheel 4;, the latter being contained ina chamber within said housing, and meshing with a worm 5 on a transversedriving'shaft- 6, located atone side of the housing and free to turn in,

bearings in a cap 7 lted to the side of the housing, as shown in Fig. 3.Y V

Connected to the hub of the worm wheel 4 by a spline and groovetFig. 4)or other equivalent means, is a which is thus compelled to rotate withthe worm wheel but is free to slide vertically back and forth throughthe same, this spindle carrying, at its upper end, a boring head 10 withprojecting cutters 11, ,as shown in Fig. 3.

Secured to and depending from the lower end of the worm wheel hub is asleeve 12' whose lower end has its bearing'in a ring 13 provided withir'fiange which is mounted upon and secured to a three-armed frame orspider 14, the latter being mounted up'on boring spindle 9,

Specifioatidn of Letters Patent. Patented J 11 4,, 1912,

Application filed April 16, 1909. Serial No. 490,265. I

brackets 15 secured to the supporting legs 2 of the machine; 3 y

Bolted to the lower end of the sleeve 12 is a head 16 having aprojecting arm ,17 carrying a depending spindle 19, and upon the latteris free to turn a hub 20, having. at its lower end, a star wheel 21 towhich intermittent movements of partial rotation are imparted by contactof the arms of the wheel with a pin 22 projecting upwardly from a plate23, the latter being suspended from. the frame or spider 14 by means'ofdepending posts 2 1. 1

To the hub '20 of the star 'wheel2-1 is keyed a spur pinion 25 whichmeshes'with a spur wheel 26 secured to the stem of a feed screw 27 thelatter being contained within a 'centralopening of the:boring spindle 9and engaging with a nut 29 let unto the lower end of said spindle,and'suitably secured therein. On each rotationof the sleeve 12,therefore, one of th e'arms of the star wheel 21 will contact with thepi n and a movement of partial rotation will be lmparted to said starwheel and thence, through the gearing described, to

the stem of the feed screw 27 so as to efiect' I movement of the boringspindle.

The plate 23 has an outer circular row of openings 30 and an innercircular row of openings 31-, these rows of openings be-' ing onopposite sides of the axis of the star wheel 21, whereby, when the pin22 is ap-' plied to an opening of the outer row, contact of the arms ofthe star wheel therewith will cause said star wheel and consequently thefeed screw 27 to turn'in one direction,

while, if the pin is applied to an .opening'of the inner row, contact ofthe arms of the star wheel therewith will cause said star wheel andfeedscrew to rotate in the opposite direction, consequently either an upwardor a downward feed can be imparted to the boring spindle 9 by said feedscrew.

The rate of feed is determined by the number of'pins 22 employed, eachrotation of the sleeve 12-causing movement of the star wheel 21 to theextent of as many arms of the same as' there are pins so that the rateof feed of .thfi.boring tool can be readily regulated by increasing ordecre'as ting the number of these pins carriedby the plate 23.

The stem of lar 32 resting upon the head 16 atthe bottom of the sleeve12 and! said stem has, at its lower end, a 11 nd wheel 33 whereby thefeed screw can be quickly rotated and the boring spindle quicklyretracted when the boring operation has been completed, the

sleeve 12, in such case, being turned to such position that the rapidlyrotating star wheel 21 will not come into contact with a pin 22. In eachof the arms of the frame or spider 1 is a radial slot 34 and parallelingthis slot on the top of the spider I are ribs 35, one

on each side of the slot. (See Fig. 2.) Upon these ribs are mountedblocks 36 which serve for the support of the cylinder structure which isto be bored, said supporting blocks being adjustable from and to- -wardthe axis of the boring spindle, to suit different sizes of cylinderstructures and being secured in position after adjustment by means ofclamping bolts 37 passing through the slots 34. v

The supporting blocks 36 have undercut grooves 39 for the reception ofthe heads of clamping bolts 40, nuts upon the latter acting upon dogs 41supported upon blocks 42 at their outer ends and engaging, at theirinner ends, a flange upon the cylinder cylinder structure in a fixedposition and downwardly therefrom,

the rotation of the boring head permits of the operation of the machinewith the application of a minimum amount of power and renders itpossible to accomplish the accurate boring of the cylinder irrespectiveof the irregular shape of the cylinder structure or of the number ofcylinders contained therein.

The mountingof the cylinder upon the machine in inverted position alsopermits of the ready utilization of the customary flange :11, on thecylinder structure as a means of clamping the same to the supportingdevices of the machine. I claim 1. The eombinatiom-in a cylinder boringmachine, of an elevated supporting frame, a vertical boring spindlerotatably mounted in hearings on said frame and extending a boring headat the upper end of said spindle, means for mounting the cylinderstructure in an inverted position on the upper end of the elevatedsupporting frame, and means located below the elevated supporting headfor imparting to the boring spindle rotating movementand movement in thedirection of its axis.

2. The combination, in a cylinder boring machine, of an elevatedsupporting frame, clamps on said frame for engaging a flange around theopen lower end of the cylinder, and a vertically movable and rotatingboring head mounted upon the upper end of a downwardly extendingspindle, said spindle being disposed so as to travel upwardlybetween theclamps and enter the open end of the cylinder from below the same' 3.The combination, in a cylinder boring machine. of a boring spindle andits boring head, a frame in which said spindle is free to turn and toslide, radially adjustable supporting blocks against which the frontface of a flange at the end of the cylinder is adapted to bear, andclamping devices radially adjustable on said supporting blocks andconstructed to engage the back face of the flange at the end of thecylinder and-com fine said flangeto the supporting blocks.

4. The combination of the boring spindle, means for rotating the same, afeed screw axially disposed in respect to the boring spindle androtating with the same, and means for imparting rotating movement tosaid feed screw independently of its rotating movement with the spindle,said means including a head rotating with the spindle, a spur wheelsecured to the feed screw, a pinion carried by said head and meshingwithsaid spur wheel, a star wheel connected to said pinion, and one or morefixed pins for engaging said star wheel as the same is carried aroundwith the rotating head.

'5. The combination of the boring spindle, afeed screw therefor, meansfor rotating the boring spindle, feed screw operating mechanism rotatingwith the boring spindle and havlngas an element a star wheel, and aplate carrying a pin for engaging said star wheel and having provisionfor changing the position of. said pin in respect to the axis ofrotation of the star wheel whereby thedirection of rotation of thelatter may be reversed.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

; HOWARD A. PEDRICK.

Witnesses:

HAMILTON D. TUR ER, KATE A. BEADLE.

